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公开(公告)号：US11848615B2
公开(公告)日：2023-12-19
申请号：US17900027
申请日：2022-08-31
Applicant: ROHM CO., LTD.
Inventor： Satoru Nate , Yoshinori Sato
CPC classification number: H02M3/335 , H02M1/08 , H02M1/4208 , H02M3/003 , H01L27/0629 , H01L28/20 , H01L29/402 , H01L29/408 , H01L29/7816
Abstract: This power supply IC is a semiconductor integrated circuit device serving as a main part for controlling a switching power supply and is formed by integrating a feedback resistor and an output feedback control unit on a single semiconductor substrate, said feedback resistor generating a feedback voltage by dividing the output voltage of the switching power supply (or the induced voltage appearing across an auxiliary winding provided on the primary side of a transformer included in an insulation-type switching power supply), said output feedback control unit performing output feedback control of the switching power supply in accordance with the feedback voltage. The feedback resistor is a polysilicon resistor having a withstand voltage of 100 V or more. A high-voltage region having higher withstand voltage in the substrate thickness direction than the other region is formed in the semiconductor substrate, and the feedback resistor is formed on the high-voltage region.
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公开(公告)号：US20230358792A1
公开(公告)日：2023-11-09
申请号：US18348701
申请日：2023-07-07
Applicant: Rohm Co., Ltd.
Inventor： Satoru Nate , Akinobu Sawada , Natsuki Yamamoto
IPC: G01R19/175 , H02M1/08 , H03K5/1536
CPC classification number: G01R19/175 , H02M1/083 , H03K5/1536
Abstract: A zero-crossing detection circuit includes a logic unit and an input stop detection unit. The logic unit is configured to estimate a zero cross of an AC signal in accordance with at least one of a first monitoring target signal and a second monitoring target signal, respectively input through diodes from a first node and a second node between which the AC signal is applied, so as to generate a zero-crossing detection signal. The input stop detection unit is configured to compare the first monitoring target signal with the second monitoring target signal after giving an offset to one of them so as to generate an input stop detection signal. The logic unit is configured to fix a logic level of the zero-crossing detection signal in accordance with the input stop detection signal.
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公开(公告)号：US11303206B2
公开(公告)日：2022-04-12
申请号：US16707948
申请日：2019-12-09
Applicant: Rohm Co., Ltd.
Inventor： Natsuki Yamamoto , Satoru Nate
IPC: H02M3/156 , H02M3/335 , H03K17/691 , H03K17/60
Abstract: A semiconductor device disposed on a primary side of a system generating a secondary side voltage in an insulated form from a primary side voltage includes: a signal generation circuit configured to generate a voltage information signal for transmitting voltage information based on the primary side voltage to a secondary side of the system in the insulated form.
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公开(公告)号：US20220034946A1
公开(公告)日：2022-02-03
申请号：US17499138
申请日：2021-10-12
Applicant: Rohm Co., Ltd.
Inventor： Satoru Nate , Akinobu Sawada , Natsuki Yamamoto
IPC: G01R19/175 , H02M1/08 , H03K5/1536
Abstract: A zero-crossing detection circuit includes a zero-crossing detection unit arranged to compare a first monitoring target signal and a second monitoring target signal respectively input through diodes from a first node and a second node between which an AC signal is applied, so as to generate a first comparison signal, and a logic unit arranged to estimate a zero cross of the AC signal from the first comparison signal so as to generate a zero-crossing detection signal. The zero-crossing detection circuit preferably includes a monitoring unit arranged to adjust the first monitoring target signal and the second monitoring target signal to be suitable for input to the zero-crossing detection unit. The logic unit preferably counts a period of the first comparison signal and estimates a zero cross of the AC signal using a count value thereof.
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公开(公告)号：US20190207522A1
公开(公告)日：2019-07-04
申请号：US16232442
申请日：2018-12-26
Applicant: Rohm Co., Ltd.
Inventor： Yoshinori Sato , Satoru Nate , Yuta SHIROISHI
CPC classification number: H02M3/33523 , H02M1/08 , H02M2001/0025 , H02M2001/0032
Abstract: A power control device that acts as a principal controlling agent in an isolating switching power supply has a controller configured to monitor a first output detection signal commensurate with a direct-current output voltage to a load and a second output detection signal commensurate with the difference between the direct-current output voltage and its target value switch among a plurality of operating modes with varying power consumption according to the results of monitoring of the two output detection signals. The power control device may instead have a peak current switch configured to raise the peak current value of a primary current passing in an output switch on detecting a light load.
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Patent Agency Ranking
公开(公告)号：US09231483B2
公开(公告)日：2016-01-05
申请号：US13950838
申请日：2013-10-15
Applicant: ROHM CO., LTD.
Inventor： Satoru Nate
CPC classification number: H02M3/33515 , H02M3/33507 , H02M2001/0035 , Y02B70/16
Abstract: A pulse modulator generates a pulse modulation signal SPM having a duty ratio which is adjusted according to a feedback voltage Vfb that corresponds to the output voltage VOUT of a DC/DC converter. A second oscillator generates a second cyclic signal which is asserted with each of a predetermined second period. A light load detection circuit generates a light load detection signal which is asserted when the feedback voltage Vfb becomes lower than a first threshold voltage. A driving circuit drives a switching transistor according to the pulse modulation signal SPM. Furthermore, the driving circuit suspends the driving of the switching transistor during a period until the second cyclic signal is next asserted after the light load detection signal is asserted.
Abstract translation: 脉冲调制器产生具有根据对应于DC / DC转换器的输出电压VOUT的反馈电压Vfb进行调整的占空比的脉冲调制信号SPM。 第二振荡器产生第二循环信号，其以预定的第二周期中的每一个被断言。 轻负载检测电路产生当反馈电压Vfb低于第一阈值电压时被断言的轻负载检测信号。 驱动电路根据脉冲调制信号SPM驱动开关晶体管。 此外，驱动电路在轻负载检测信号被断言之后的一段时间内暂停开关晶体管的驱动，直到第二循环信号下一次被断言。
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公开(公告)号：US11764685B2
公开(公告)日：2023-09-19
申请号：US17494961
申请日：2021-10-06
Applicant: Rohm Co., Ltd.
Inventor： Satoru Nate , Yohei Akamatsu
CPC classification number: H02M3/33523 , H02M1/0025 , H02M1/0038
Abstract: The present disclosure provides a power supply control device. The power supply control device includes a feedback voltage generator, an on-timing setting unit and an off-timing setting unit. The feedback voltage generator is configured to generate a feedback voltage by sampling a primary voltage of a transformer that forms an insulated switching power supply. The on-timing setting unit is configured to turn on a primary current of the transformer based on a comparison result between the feedback voltage and a slope-shaped reference voltage. The off-timing setting unit is configured to turn off the primary current after a predetermined on time has elapsed since the primary current was turned on. A sampling timing of the primary voltage is set based on an on timing of the primary current.
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公开(公告)号：US11637489B2
公开(公告)日：2023-04-25
申请号：US17539294
申请日：2021-12-01
Applicant: ROHM Co., LTD.
Inventor： Yifei Tang , Satoru Nate
Abstract: There is provided an isolated DC/DC converter including a primary side control circuit disposed on the primary side and switching a switching element connected in series with a primary side winding of a power transformer; a secondary side control circuit disposed on the secondary side and generating a control signal including first control information and second control information on the basis of the secondary side voltage; and an insulated transmission circuit transmitting, in an insulated manner, each piece of control information included in the control signal to the primary side control circuit. The primary side control circuit controls a switching frequency of the switching element on the basis of the first control information indicating the frequency of the control signal, and controls a peak value of a primary side current on the basis of the second control information indicating the pulse width of the control signal.
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公开(公告)号：US20210099091A1
公开(公告)日：2021-04-01
申请号：US16634631
申请日：2018-05-24
Applicant: Rohm Co., Ltd.
Inventor： Yoshinori Sato , Satoru Nate
IPC: H02M3/335 , H03K17/687 , H02M1/00 , G01R19/165
Abstract: A current limiter 200 (corresponding to an example of a current detection circuit) has a comparator 210 and a variable delay unit 220. The comparator 210 switches a comparison signal OCP from a low level to a high level when the current to be monitored, which flows through an output switch, reaches a predetermined threshold value (in the present figure, when a sense voltage Vcs reaches an overcurrent detection voltage Vocp). The variable delay unit 220 measures a first time T1 from when the output switch turns on by SET=H until when the comparison signal OCP switches to the high level and delays the comparison signal OCP by a second time T2 (=K·T12) proportional to the square of the first time T1 to generate an overcurrent detection signal Sc. The variable delay unit 220 includes a first timer 223 for measuring the first time T1 and a second timer 224 for generating the overcurrent detection signal Sc by delaying the comparison signal OCP by the second time T2.
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公开(公告)号：US10957636B2
公开(公告)日：2021-03-23
申请号：US16588463
申请日：2019-09-30
Applicant: Rohm Co., Ltd.
Inventor： Makoto Hirata , Shingo Matsumaru , Satoru Nate
IPC: H01L23/495 , H01L23/31 , H01L23/00 , H01L25/16
Abstract: A semiconductor device includes leads, a switching element, a control element that controls the switching element, and a resin member covering the switching element, the control element and parts of the respective leads. The leads include a drain lead connected to a drain electrode of the switching element, a source lead connected to a source electrode of the switching element, and at least one control lead connected to the control element. The resin member includes a drain exposed portion at which the drain lead is exposed, a source exposed portion at which the source lead is exposed, and a control exposed portion at which the control lead is exposed. The distance in a first direction between the drain exposed portion and the source exposed portion is larger than the distance in the first direction between the control exposed portion and the source exposed portion.
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